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Share-based compensation - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Sep. 10, 2004
Sep. 17, 2014
Aug. 27, 2008
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]            
Share based compensation expense       $ 34,000 $ 34,000  
Issuance of stock option to purchase stock       6,000,000    
Common stock reserved for issuance       3,251,340    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 17,600,000   $ 17,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 916,787 $ 306,000  
2004 Stock Incentive Plan            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]            
Common stock reserved for issuance 2,500,000          
Plan expiration date Sep. 10, 2014          
2014 Stock Incentive Plan            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]            
Common stock reserved for issuance   3,000,000        
Plan expiration date   Sep. 17, 2024        
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock   110.00%        
2008 Stock Incentive Plan            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]            
Common stock reserved for issuance     3,000,000      
Plan expiration date     Aug. 27, 2018      
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock     110.00%